{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x37c3f29318d4270fed278912a941bafa6fe0bf4a6c35d9c85bf35edb49668a1e",
    "signature": "0xff4f47f154ca8814f716322ac214e60eaa78afed59fb872e46bc7fba778f3e44390722649f0eb6363cd4048251aa617d0e8592c73290316dc3ea5b1dfd0268741c",
    "signer": "0x8e638Fe82AbEFe345B725c1d4Fe2397ef23e8C4c",
    "userId": "948300984"
  }
}